Function extendr_api::R_registerRoutines

pub unsafe extern "C" fn R_registerRoutines(
    info: *mut _DllInfo, 
    croutines: *const R_CMethodDef, 
    callRoutines: *const R_CallMethodDef, 
    fortranRoutines: *const R_CMethodDef, 
    externalRoutines: *const R_CallMethodDef
) -> i32